You have a subject with the following measurements: Highest pressure at the mout
ID: 71742 • Letter: Y
Question
You have a subject with the following measurements: Highest pressure at the mouth during inspiration = 40 cm H2O, highest pressure in the alveoli during inspiration = 30 cm H2O, end-expiratory pressure = 0 cm H2O, inspiratory flow rate = 50 L/minute, VT = 350 mL. Select correct or incorrect for each of the following statements.
Cs = 11.7 ml/cm H2O
Raw = 0.2 cm H2O/L/sec
The value of one time constant = 0.14 sec
The compliance is within normal limits
- A. B.Cs = 11.7 ml/cm H2O
- A. B.Raw = 0.2 cm H2O/L/sec
- A. B.The value of one time constant = 0.14 sec
- A. B.The compliance is within normal limits
Explanation / Answer
1. Cs = Vt/ Pplateu - Ppeep = 350/30 - 0 = 11.66 - Correct
2. Raw = dep P/V = 30/50 = 0.6 cm H2O/L/Sec - Incorrect
3. The value of one time constant = Raw X Compliance= 0.6 X 1.6 = 0.96 - Incorrect answer
4. The compliance is within normal limits- correct = 50/30 = 1.6
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